Finding the Fourth Proportional to 2,187.60, 3,016.80 and 1,689.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.60 : 3,016.80 = 1,689.42 : x
2. Step 2: Convert to fraction form
   2,187.60/3,016.80 = 1,689.42/x
3. Step 3: Cross multiply
   2,187.60x = 3,016.80 × 1,689.42
4. Step 4: Simplify right side
   2,187.60x = 5,096,642.26
5. Step 5: Solve for x
   x = 5,096,642.26/2,187.60
6. Step 6: Final answer
   x = 2,329.79